login
A104652
Numbers k such that 29*k^2 + 29*k +1 = n^2, n sequence = A104651.
1
0, 32, 3080, 6720, 637032, 60383960, 131735240, 12487111096, 1183646396800, 2582274191000, 244772352350624, 23201836730467360, 50617738823727040, 4798027663264052544, 454802404774267597320, 992208919004971638880, 94050938500074310327912
OFFSET
1,2
FORMULA
a(1)=0, a(2)=32, a(3)=3080, a(4)=19602*a(1)+9800-a(3), a(5)=19602*a(2)+9800-a(2), a(6)=19602*a(3)+9800-a(1), then a(n)=19602*a(n-3)+9800-a(n-6).
G.f.: 8*x^2*(4+381*x+455*x^2+381*x^3+4*x^4) / ( (x-1)*(x^6+19602*x^3-1) ). - R. J. Mathar, Aug 23 2011
CROSSREFS
Cf. A104651.
Sequence in context: A113500 A064018 A067321 * A219228 A135787 A016793
KEYWORD
nonn,easy
AUTHOR
Pierre CAMI, Apr 22 2005
EXTENSIONS
More terms from Colin Barker, Apr 16 2014
STATUS
approved